When you audition on camera the first thing that anyone sees is the color you're wearing. Wear something depressing, annoying, or threatening, and no matter how brilliant your performance, they are going to be affected by the color first and the performance second.

I don’t believe most of those new to the acting business would try to get work in any other occupation or career without getting the training or doing the necessary preparation to compete in their market.

Your slate tells those viewing your audition if you are “cast-able." Much of that decision to watch past your slate is based on whether your physicality fits their specs and whether the viewing public will identify with you or aspire to be you.

Based on all my experience as an actor, casting director, and teacher, I do believe there is a casting formula for getting callbacks. It is only my educated opinion but I really believe that this is basically the formula and value percentages.